Bump terraform-google-modules/bastion-host/google in /terraform

Bumps [terraform-google-modules/bastion-host/google](https://github.com/terraform-google-modules/terraform-google-bastion-host) from 5.3.0 to 6.0.0.
- [Release notes](https://github.com/terraform-google-modules/terraform-google-bastion-host/releases)
- [Changelog](https://github.com/terraform-google-modules/terraform-google-bastion-host/blob/master/CHANGELOG.md)
- [Commits](terraform-google-modules/terraform-google-bastion-host@v5.3.0...v6.0.0)

---
updated-dependencies:
- dependency-name: terraform-google-modules/bastion-host/google
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

terraform/bastion-host.tf

@@ -17,7 +17,7 @@
 # https://registry.terraform.io/modules/terraform-google-modules/bastion-host/google/latest
 module "iap_bastion" {
   source  = "terraform-google-modules/bastion-host/google"
-  version = "5.3.0"
+  version = "6.0.0"
 
   disk_type      = "pd-ssd"
   network        = module.gcp_network.network_name